If Microsoft monoculture is a threat to National security, then it is more of a threat to business organizations.

Dan Geer lost his job, but gained his audience. The very idea that got the computer security expert fired has sparked serious debate in information technology. The idea, borrowed from biology, is that Microsoft has nurtured a software "monoculture" that threatens global computer security. (Source: Wired)

Geer and others believe Microsoft's software is so dangerously pervasive that a virus capable of exploiting even a single flaw in its operating systems could wreak havoc. (Source: Wired)